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avformat/wavdec: Check block_align vs. channels before combining them

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Fixes: signed integer overflow: 65535 * 65312 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_WAV_fuzzer-6606935226974208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-17 23:16:46 +01:00
parent fd61b42b4c
commit 0af0a80cef
1 changed files with 2 additions and 1 deletions
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libavformat/wavdec.c
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@ -643,7 +643,8 @@ break_loop:
} else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
st->codecpar->codec_id == AV_CODEC_ID_XMA2) {
st->codecpar->block_align = 2048;
} else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2) {
} else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2 &&
st->codecpar->block_align < INT_MAX / st->codecpar->channels) {
st->codecpar->block_align *= st->codecpar->channels;
}